Does Kestrel train on my strategy, my prompts, or my trading data?

The policy in one axis

Free is licensed; paid is proprietary. Anonymous free usage — the no-signup trial an agent mints from the CLI — grants the platform a training license over its own traces, and that license is the free tier’s only price: no card, no account, no identity. Paid usage is 100% proprietary to the customer and is never trained on. The boundary is contractual, not a preference toggle — the terms are bound into the 402 Offer your agent settles, and they are machine-readable before you commit (dataLicense: free-is-licensed/paid-is-proprietary in /.well-known/agents.json).

What a trace is — and what it never includes

A trace is the platform-side record of what your free-tier run did against the substrate: the calls it made, the deterministic plan it armed, the Frames it was served, the graded outcome. Traces are not public by default — the proof URLs you choose to mint are public, because minting a publicly recomputable receipt is the point of minting. And a trace never includes your model or your prompts, because those never enter the platform at all: your intelligence runs on your side and calls the substrate over HTTP (or the equal MCP, CLI, and SDK projections).

Strategy authorship stays yours — enforced, not promised

The platform hosts deterministic reflexes and evidence, never an agent’s intelligence, and an author-provenance guard refuses any certified record that credits strategy authorship to the platform. If even the licensed traces are more than you want to grant, the dial is yours: move to paid and the traces are proprietary too. The model-capture side of this question — whether the platform hosts or captures your brain — has its own page: /answers/brains-stay-outside.

Falsify the substrate this page describes

The licensing terms ride the same substrate as everything else here, and the substrate’s receipts are recomputable. This page pins a free-tier proof minted anonymously — recompute it, then read the terms an agent is shown before it commits at /.well-known/agents.json:

Mint your own with npx kestrel.markets@latest sim <slug> — the whole exchange this page describes, license and all, happens with no account and no human in the loop.